/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hive.ql.udf.generic;
import org.apache.hadoop.hive.ql.exec.FunctionRegistry;
import org.apache.hadoop.hive.ql.exec.UDFArgumentException;
import org.apache.hadoop.hive.ql.exec.UDFArgumentTypeException;
import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.serde2.io.DoubleWritable;
import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspectorConverters.Converter;
import org.apache.hadoop.hive.serde2.objectinspector.PrimitiveObjectInspector;
import org.apache.hadoop.hive.serde2.objectinspector.primitive.PrimitiveObjectInspectorFactory;
import org.apache.hadoop.hive.serde2.typeinfo.DecimalTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.PrimitiveTypeInfo;
import org.apache.hadoop.hive.serde2.typeinfo.TypeInfoFactory;
import org.apache.hadoop.io.LongWritable;
public abstract class GenericUDFFloorCeilBase extends GenericUDF {
private final String opName;
protected String opDisplayName;
private transient PrimitiveObjectInspector inputOI;
private transient PrimitiveObjectInspector resultOI;
private transient Converter converter;
protected LongWritable longWritable = new LongWritable();
protected HiveDecimalWritable decimalWritable = new HiveDecimalWritable();
public GenericUDFFloorCeilBase() {
opName = getClass().getSimpleName();
}
@Override
public ObjectInspector initialize(ObjectInspector[] arguments) throws UDFArgumentException {
if (arguments.length != 1) {
throw new UDFArgumentException(opName + " requires one argument.");
}
Category category = arguments[0].getCategory();
if (category != Category.PRIMITIVE) {
throw new UDFArgumentTypeException(0, "The "
+ GenericUDFUtils.getOrdinal(1)
+ " argument of " + opName + " is expected to a "
+ Category.PRIMITIVE.toString().toLowerCase() + " type, but "
+ category.toString().toLowerCase() + " is found");
}
inputOI = (PrimitiveObjectInspector) arguments[0];
if (!FunctionRegistry.isNumericType(inputOI.getTypeInfo())) {
throw new UDFArgumentTypeException(0, "The "
+ GenericUDFUtils.getOrdinal(1)
+ " argument of " + opName + " is expected to a "
+ "numeric type, but "
+ inputOI.getTypeName() + " is found");
}
PrimitiveTypeInfo resultTypeInfo = null;
PrimitiveTypeInfo inputTypeInfo = inputOI.getTypeInfo();
if (inputTypeInfo instanceof DecimalTypeInfo) {
DecimalTypeInfo decTypeInfo = (DecimalTypeInfo) inputTypeInfo;
resultTypeInfo = TypeInfoFactory.getDecimalTypeInfo(
decTypeInfo.precision() - decTypeInfo.scale() + 1, 0);
ObjectInspector decimalOI = PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(decTypeInfo);
converter = ObjectInspectorConverters.getConverter(inputOI, decimalOI);
} else {
resultTypeInfo = TypeInfoFactory.longTypeInfo;
ObjectInspector doubleObjectInspector = PrimitiveObjectInspectorFactory.writableDoubleObjectInspector;
converter = ObjectInspectorConverters.getConverter(inputOI, doubleObjectInspector);
}
return resultOI =
PrimitiveObjectInspectorFactory.getPrimitiveWritableObjectInspector(resultTypeInfo);
}
@Override
public Object evaluate(DeferredObject[] arguments) throws HiveException {
if (arguments[0] == null) {
return null;
}
Object input = arguments[0].get();
if (input == null) {
return null;
}
input = converter.convert(input);
if (input == null) {
return null;
}
switch (resultOI.getPrimitiveCategory()) {
case LONG:
return evaluate((DoubleWritable)input);
case DECIMAL:
return evaluate((HiveDecimalWritable)input);
default:
// Should never happen.
throw new IllegalStateException("Unexpected type in evaluating " + opName + ": " +
inputOI.getPrimitiveCategory());
}
}
protected abstract LongWritable evaluate(DoubleWritable input);
protected abstract HiveDecimalWritable evaluate(HiveDecimalWritable input);
@Override
public String getDisplayString(String[] children) {
assert (children.length == 1);
return opDisplayName + "(" + children[0] + ")";
}
}